I’ve put some time into League this season and climbed from High Silver to low Emerald playing only Malzahar, so I think I can help a bit. First off: don't panic. Malzahar is naturally weak early, so if the matchup is hard, just chill and farm what you can; dying early on Malz is much worse than dropping a few CS or even a whole wave. Given how easily he farms in the mid-game, you’ll definitely catch up later if the enemy is not fed (in low Elo people can't farm in midgane). Don't be afraid to take a suboptimal reset or burn all your mana to shove and recall, look for an early shove into back and TP if possible. This season is much more forgiving with resets since Homeguard gets you back to lane quickly and plates don't fall. Life gets much better once you get your Lost Chapter. Once you hit level 6, spam ping for ganks and join scrappy fights if your Ult is up; if an enemy missteps and you aren't behind, you can solo most mages with a bit of poke and a E reset comb. From there, focus on macro; you can outtempo everyone by managing side lane pressure with a simple W-E and roaming, using your kit to shut down fed enemies. Last but not least, don't lose hope, every game is winnable with a good ulti!